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'Machine, helper and crew. 350 tons a day, per 8 hour shift.'

1849. Continuous Mining Machine, Helper and Crew

Two dogs harnessed to coal carts. About 1890, Ohio Coal Mine. This photograph is the property of Pittsburgh Consolidation Coal Co.

1850. Dogs in Harness, Ohio Coal Mine

1851. Miners Operating a Cutting Machine

Miner drilling a hole for explosives at the Bishop Mine, Pocahontas Fuel Co.

1852. Drilling Prior to Placing Explosives at Bishop Mine, Pocahontas Fuel Company

Miners drill two or more holes into coal to place the explosive charges.

1853. Drilling Prior to Setting Explosives

Miner drilling holes for explosives at Jamison No. 9.

1854. Drilling Prior to 'Setting' Explosives at Jamison No. 9

Electric mine locomotive at Mathies Coal mine, Finleyville, PA.

1855. G-E 50 Ton Electric Mine Locomotive in Operation at Mathies Coal Mine, Finleyville, Pa.

Two miners working to support the roof in the Itmann Coal Co. mine. <br /><br />

1856. Miners at Work in an Itmann Coal Company Mine

A miner operating an electric shuttle car filled with coal.

1857. Electric Shuttle Car

Two miners watching dogs haul loads of coal.

1858. Dog Mines, Zanesville, Ohio

Two miners watching dogs haul loads of coal.

1859. Dog Mines, Zanesville, Ohio

Group portrait of miners and horses inside a mine. 'Dr. Parkinson said a copy of this picture appeared in Natural Geographic's Pictorical Study of Appalachia.'

1860. Miners and Their Horses